"I have a brutally short attention span. It means I'm useless at working out," she tells the magazine (via Just Jared). "I get so bored. I have cellulite and stretch marks -- and I have a muffin top!"
This isn't the first time Alba has shared her disdain for the gym. Shortly before welcoming her second daughter, Haven, in 2011, Alba told Lucky magazine, "In the gym, I have like five things to distract me: TV, iPod, magazines. [Workout] partners are good, too, so you can chat and not just drown in your own misery. Sorry, does that sound bad? I just hate working out."
But the actress and author of "The Honest Life: Living Naturally and True to You" has been trying to compensate with healthy eating.
"I started cooking for myself at 12 because a lot of food my family ate was processed. I wanted fresh," she explains to Women's Health UK. "I eliminated microwave foods, things with too much salt, and tried to eat more natural food, things that were cooked in a kitchen as opposed to a factory."
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